\begin{tikzpicture}
    \tkzDefPoints{0/0/A, 0.6/0/B, 1.6/0/C, 2.2/0/D}

    \tkzDrawLine[add=0.2 and 0.2](A,D)
    \tkzDrawPoints[fill=black](A,B,C,D)
    \tkzLabelPoints[below](A,B,C,D)
\end{tikzpicture}

